Mariam works in a shop. She earns $5.20 per hour. She also earns a bonus of 15% of the value of the items she sells in a week. In one week she works for 32 hours and sells items with a value of £2450. Calculate Mariam's total earnings for the week.

1. (a)(i)Mariam works in a shop. She earns $5.20 per hour. She also earns a bonus of 15% of the value of the items she sells in a week. In one week she works for 32 hours and sells items with a value of £2450. Calculate Mariam's total earnings for the week.[2]
2. (a)(ii)In another week, Mariam worked for 28 hours and earned a total of $409.60. Calculate the value of the items she sold that week.[3]
3. (b)(i)Jack opens a bank account paying simple interest. He pays in $800 and leaves it in the account for 4 years. At the end of 4 years he closes the account and receives $920. Calculate the percentage rate of simple interest paid per year.[2]
4. (b)(ii)Jack uses some of the $920 to pay for a holiday and a computer. He saves the remainder. The money is divided between the holiday, computer and savings in the ratio 4:5:7. Calculate the amount he saves.[2]